The Excel WORKDAY.INTL Function

Basic Description

The Excel Workday.Intl function returns a date that is a supplied number of working days (excluding weekends
and holidays) ahead of a given start date. The function allows the user to specify which days are counted as weekends.

The function is new in Excel 2010 and so is not available in earlier versions of Excel. However, it is similar to
the Workday function, which is available in
earlier versions of Excel.

The format of the Workday.Intl function is:

WORKDAY.INTL( start_date, days, [weekend], [holidays] )

where the arguments are as follows:

start_date

-

The initial date, from which to count the number of workdays

days

-

The number of workdays to add onto start_date

[weekend]

-

An optional argument, which specifies which weekdays should be counted as weekends.
This can be either a number or a string. These are explained below:

Possible number values for the [weekend] argument are:

[weekend]

days countedas weekend

1(or omitted)

Sat & Sun

2

Sun & Mon

3

Mon & Tue

4

Tue & Wed

5

Wed & Thu

6

Thu & Fri

7

Fri & Sat

11

Sunday only

12

Monday only

13

Tuesday only

14

Wednesday only

15

Thursday only

16

Friday only

17

Saturday only

Possible string values for the [weekend] argument consist of a series of seven 0's and 1's
which represent the seven weekdays, starting from Monday.

Each 1 denotes a day that should be counted as a weekend and each 0 represents a working day.

For example,

0000100

-

denotes Fridays only counted as weekend days

0001100

-

denotes Thursdays and Fridays counted as weekend days

0000111

-

denotes Fridays, Saturdays and Sundays counted as weekend days

The string "1111111" is not valid.

[holidays]

-

An optional argument, which specifies an array of dates (in addition to weekends) that are not
to be counted as working days

Note that the start_date and [holidays] arguments should be input as either:

References to cells containing dates

or

Dates returned from formulas

- If you attempt to input these date arguments as text, Excel may misinterpret
them, due to different date systems, or date interpretation settings.

Warning:
Although you can input date arguments as date serial numbers, this is not recommended
as date serial numbering does vary across different computer systems.

Workday.Intl Examples

The spreadsheets below show examples of the Excel Workday.Intl function.
The format of the function is shown in the spreadsheet at the top and the results are shown below.

Formulas:

Results:

In the above spreadsheets :

In the example in cell D2 the holidays array has been omitted.
Therefore the calculation excludes Saturdays and Sundays but includes all other weekdays,
including the holidays at Christmas and New Year.

In the example in cell D3 the [weekend] argument is 1 (specifying weekends
on Saturdays and Sundays) and the holidays array (in cells B2 - B4) is provided to the Workday.Intl function.
Therefore the calculation excludes Saturdays and Sundays and the listed Christmas and New Year holidays.

In the example in cell D4 Fridays, Saturdays and Sundays are specified as weekends, but no holiday array has
been supplied to the function. Therefore the calculation excludes Fridays, Saturdays and Sundays but includes
all other weekdays, including the holidays at Christmas and New Year.

Note also that, as recommended by Microsoft, in all three calls to the Workday.Intl function, the start_date and
[holidays] arguments have been supplied as cell references.